X-Git-Url: https://vcs.fsf.org/?p=exim.git;a=blobdiff_plain;f=src%2Fsrc%2Ftls-gnu.c;h=dab96974ce8fc2c33dc9810299b1b2d8e707c51b;hp=e02cf1cea8eb621f1138b613212f1ee9bd489c83;hb=c0635b6dfe65ee24c2fb8d165beabc608d2fd1a5;hpb=4c04137d73637107669e02b21f890387aaa2ef34

diff --git a/src/src/tls-gnu.c b/src/src/tls-gnu.c
index e02cf1cea..dab96974c 100644
--- a/src/src/tls-gnu.c
+++ b/src/src/tls-gnu.c
@@ -2,7 +2,7 @@
 *     Exim - an Internet mail transport agent    *
 *************************************************/
 
-/* Copyright (c) University of Cambridge 1995 - 2015 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 /* Copyright (c) Phil Pennock 2012 */
@@ -13,7 +13,7 @@ tls.c when USE_GNUTLS has been set.
 
 The code herein is a revamp of GnuTLS integration using the current APIs; the
 original tls-gnu.c was based on a patch which was contributed by Nikos
-Mavroyanopoulos.  The revamp is partially a rewrite, partially cut&paste as
+Mavrogiannopoulos.  The revamp is partially a rewrite, partially cut&paste as
 appropriate.
 
 APIs current as of GnuTLS 2.12.18; note that the GnuTLS manual is for GnuTLS 3,
@@ -60,10 +60,31 @@ require current GnuTLS, then we'll drop support for the ancient libraries).
 #if GNUTLS_VERSION_NUMBER >= 0x030014
 # define SUPPORT_SYSDEFAULT_CABUNDLE
 #endif
+#if GNUTLS_VERSION_NUMBER >= 0x030109
+# define SUPPORT_CORK
+#endif
+#if GNUTLS_VERSION_NUMBER >= 0x030506 && !defined(DISABLE_OCSP)
+# define SUPPORT_SRV_OCSP_STACK
+#endif
+
+#ifdef SUPPORT_DANE
+# if GNUTLS_VERSION_NUMBER >= 0x030000
+#  define DANESSL_USAGE_DANE_TA 2
+#  define DANESSL_USAGE_DANE_EE 3
+# else
+#  error GnuTLS version too early for DANE
+# endif
+# if GNUTLS_VERSION_NUMBER < 0x999999
+#  define GNUTLS_BROKEN_DANE_VALIDATION
+# endif
+#endif
 
 #ifndef DISABLE_OCSP
 # include <gnutls/ocsp.h>
 #endif
+#ifdef SUPPORT_DANE
+# include <gnutls/dane.h>
+#endif
 
 /* GnuTLS 2 vs 3
 
@@ -79,7 +100,7 @@ Changes:
 /* Values for verify_requirement */
 
 enum peer_verify_requirement
-  { VERIFY_NONE, VERIFY_OPTIONAL, VERIFY_REQUIRED };
+  { VERIFY_NONE, VERIFY_OPTIONAL, VERIFY_REQUIRED, VERIFY_DANE };
 
 /* This holds most state for server or client; with this, we can set up an
 outbound TLS-enabled connection in an ACL callout, while not stomping all
@@ -100,6 +121,7 @@ typedef struct exim_gnutls_state {
   int			fd_in;
   int			fd_out;
   BOOL			peer_cert_verified;
+  BOOL			peer_dane_verified;
   BOOL			trigger_sni_changes;
   BOOL			have_set_peerdn;
   const struct host_item *host;
@@ -120,11 +142,14 @@ typedef struct exim_gnutls_state {
   uschar *exp_tls_verify_certificates;
   uschar *exp_tls_crl;
   uschar *exp_tls_require_ciphers;
-  uschar *exp_tls_ocsp_file;
   const uschar *exp_tls_verify_cert_hostnames;
 #ifndef DISABLE_EVENT
   uschar *event_action;
 #endif
+#ifdef SUPPORT_DANE
+  char * const *	dane_data;
+  const int *		dane_data_len;
+#endif
 
   tls_support *tlsp;	/* set in tls_init() */
 
@@ -136,16 +161,45 @@ typedef struct exim_gnutls_state {
 } exim_gnutls_state_st;
 
 static const exim_gnutls_state_st exim_gnutls_state_init = {
-  NULL, NULL, NULL, VERIFY_NONE, -1, -1, FALSE, FALSE, FALSE,
-  NULL, NULL, NULL, NULL,
-  NULL, NULL, NULL, NULL, NULL, NULL,
-  NULL, NULL, NULL, NULL, NULL, NULL, NULL,
-  NULL,
+  .session =		NULL,
+  .x509_cred =		NULL,
+  .priority_cache =	NULL,
+  .verify_requirement =	VERIFY_NONE,
+  .fd_in =		-1,
+  .fd_out =		-1,
+  .peer_cert_verified =	FALSE,
+  .peer_dane_verified =	FALSE,
+  .trigger_sni_changes =FALSE,
+  .have_set_peerdn =	FALSE,
+  .host =		NULL,
+  .peercert =		NULL,
+  .peerdn =		NULL,
+  .ciphersuite =	NULL,
+  .received_sni =	NULL,
+
+  .tls_certificate =	NULL,
+  .tls_privatekey =	NULL,
+  .tls_sni =		NULL,
+  .tls_verify_certificates = NULL,
+  .tls_crl =		NULL,
+  .tls_require_ciphers =NULL,
+
+  .exp_tls_certificate = NULL,
+  .exp_tls_privatekey =	NULL,
+  .exp_tls_verify_certificates = NULL,
+  .exp_tls_crl =	NULL,
+  .exp_tls_require_ciphers = NULL,
+  .exp_tls_verify_cert_hostnames = NULL,
 #ifndef DISABLE_EVENT
-                                            NULL,
+  .event_action =	NULL,
 #endif
-  NULL,
-  NULL, 0, 0, 0, 0,
+  .tlsp =		NULL,
+
+  .xfer_buffer =	NULL,
+  .xfer_buffer_lwm =	0,
+  .xfer_buffer_hwm =	0,
+  .xfer_eof =		0,
+  .xfer_error =		0,
 };
 
 /* Not only do we have our own APIs which don't pass around state, assuming
@@ -189,7 +243,8 @@ static BOOL gnutls_buggy_ocsp = FALSE;
 
 /* Set this to control gnutls_global_set_log_level(); values 0 to 9 will setup
 the library logging; a value less than 0 disables the calls to set up logging
-callbacks. */
+callbacks.  Possibly GNuTLS also looks for an environment variable
+"GNUTLS_DEBUG_LEVEL". */
 #ifndef EXIM_GNUTLS_LIBRARY_LOG_LEVEL
 # define EXIM_GNUTLS_LIBRARY_LOG_LEVEL -1
 #endif
@@ -205,10 +260,13 @@ before, for now. */
 # define EXIM_SERVER_DH_BITS_PRE2_12 1024
 #endif
 
-#define exim_gnutls_err_check(Label) do { \
-  if (rc != GNUTLS_E_SUCCESS) { return tls_error((Label), gnutls_strerror(rc), host); } } while (0)
+#define exim_gnutls_err_check(rc, Label) do { \
+  if ((rc) != GNUTLS_E_SUCCESS) \
+    return tls_error((Label), gnutls_strerror(rc), host, errstr); \
+  } while (0)
 
-#define expand_check_tlsvar(Varname) expand_check(state->Varname, US #Varname, &state->exp_##Varname)
+#define expand_check_tlsvar(Varname, errstr) \
+  expand_check(state->Varname, US #Varname, &state->exp_##Varname, errstr)
 
 #if GNUTLS_VERSION_NUMBER >= 0x020c00
 # define HAVE_GNUTLS_SESSION_CHANNEL_BINDING
@@ -264,29 +322,18 @@ Argument:
             usually obtained from gnutls_strerror()
   host      NULL if setting up a server;
             the connected host if setting up a client
+  errstr    pointer to returned error string
 
 Returns:    OK/DEFER/FAIL
 */
 
 static int
-tls_error(const uschar *prefix, const char *msg, const host_item *host)
+tls_error(const uschar *prefix, const char *msg, const host_item *host,
+  uschar ** errstr)
 {
-if (host)
-  {
-  log_write(0, LOG_MAIN, "H=%s [%s] TLS error on connection (%s)%s%s",
-      host->name, host->address, prefix, msg ? ": " : "", msg ? msg : "");
-  return FAIL;
-  }
-else
-  {
-  uschar *conn_info = smtp_get_connection_info();
-  if (Ustrncmp(conn_info, US"SMTP ", 5) == 0)
-    conn_info += 5;
-  /* I'd like to get separated H= here, but too hard for now */
-  log_write(0, LOG_MAIN, "TLS error on %s (%s)%s%s",
-      conn_info, prefix, msg ? ": " : "", msg ? msg : "");
-  return DEFER;
-  }
+if (errstr)
+  *errstr = string_sprintf("(%s)%s%s", prefix, msg ? ": " : "", msg ? msg : "");
+return host ? FAIL : DEFER;
 }
 
 
@@ -310,7 +357,8 @@ Returns:   nothing
 static void
 record_io_error(exim_gnutls_state_st *state, int rc, uschar *when, uschar *text)
 {
-const char *msg;
+const char * msg;
+uschar * errstr;
 
 if (rc == GNUTLS_E_FATAL_ALERT_RECEIVED)
   msg = CS string_sprintf("%s: %s", US gnutls_strerror(rc),
@@ -318,7 +366,18 @@ if (rc == GNUTLS_E_FATAL_ALERT_RECEIVED)
 else
   msg = gnutls_strerror(rc);
 
-tls_error(when, msg, state->host);
+(void) tls_error(when, msg, state->host, &errstr);
+
+if (state->host)
+  log_write(0, LOG_MAIN, "H=%s [%s] TLS error on connection %s",
+    state->host->name, state->host->address, errstr);
+else
+  {
+  uschar * conn_info = smtp_get_connection_info();
+  if (Ustrncmp(conn_info, US"SMTP ", 5) == 0) conn_info += 5;
+  /* I'd like to get separated H= here, but too hard for now */
+  log_write(0, LOG_MAIN, "TLS error on %s %s", conn_info, errstr);
+  }
 }
 
 
@@ -400,6 +459,9 @@ tlsp->cipher = state->ciphersuite;
 DEBUG(D_tls) debug_printf("cipher: %s\n", state->ciphersuite);
 
 tlsp->certificate_verified = state->peer_cert_verified;
+#ifdef SUPPORT_DANE
+tlsp->dane_verified = state->peer_dane_verified;
+#endif
 
 /* note that tls_channelbinding_b64 is not saved to the spool file, since it's
 only available for use for authenticators while this TLS session is running. */
@@ -454,7 +516,7 @@ Returns:     OK/DEFER/FAIL
 */
 
 static int
-init_server_dh(void)
+init_server_dh(uschar ** errstr)
 {
 int fd, rc;
 unsigned int dh_bits;
@@ -470,12 +532,12 @@ host_item *host = NULL; /* dummy for macros */
 DEBUG(D_tls) debug_printf("Initialising GnuTLS server params.\n");
 
 rc = gnutls_dh_params_init(&dh_server_params);
-exim_gnutls_err_check(US"gnutls_dh_params_init");
+exim_gnutls_err_check(rc, US"gnutls_dh_params_init");
 
 m.data = NULL;
 m.size = 0;
 
-if (!expand_check(tls_dhparam, US"tls_dhparam", &exp_tls_dhparam))
+if (!expand_check(tls_dhparam, US"tls_dhparam", &exp_tls_dhparam, errstr))
   return DEFER;
 
 if (!exp_tls_dhparam)
@@ -494,7 +556,7 @@ else if (Ustrcmp(exp_tls_dhparam, "none") == 0)
 else if (exp_tls_dhparam[0] != '/')
   {
   if (!(m.data = US std_dh_prime_named(exp_tls_dhparam)))
-    return tls_error(US"No standard prime named", CS exp_tls_dhparam, NULL);
+    return tls_error(US"No standard prime named", CS exp_tls_dhparam, NULL, errstr);
   m.size = Ustrlen(m.data);
   }
 else
@@ -506,7 +568,7 @@ else
 if (m.data)
   {
   rc = gnutls_dh_params_import_pkcs3(dh_server_params, &m, GNUTLS_X509_FMT_PEM);
-  exim_gnutls_err_check(US"gnutls_dh_params_import_pkcs3");
+  exim_gnutls_err_check(rc, US"gnutls_dh_params_import_pkcs3");
   DEBUG(D_tls) debug_printf("Loaded fixed standard D-H parameters\n");
   return OK;
   }
@@ -516,7 +578,7 @@ if (m.data)
 different filename and ensure we have sufficient bits. */
 dh_bits = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, GNUTLS_SEC_PARAM_NORMAL);
 if (!dh_bits)
-  return tls_error(US"gnutls_sec_param_to_pk_bits() failed", NULL, NULL);
+  return tls_error(US"gnutls_sec_param_to_pk_bits() failed", NULL, NULL, errstr);
 DEBUG(D_tls)
   debug_printf("GnuTLS tells us that for D-H PK, NORMAL is %d bits.\n",
       dh_bits);
@@ -540,7 +602,7 @@ if (use_file_in_spool)
   {
   if (!string_format(filename_buf, sizeof(filename_buf),
         "%s/gnutls-params-%d", spool_directory, dh_bits))
-    return tls_error(US"overlong filename", NULL, NULL);
+    return tls_error(US"overlong filename", NULL, NULL, errstr);
   filename = filename_buf;
   }
 
@@ -557,39 +619,39 @@ if ((fd = Uopen(filename, O_RDONLY, 0)) >= 0)
     {
     saved_errno = errno;
     (void)close(fd);
-    return tls_error(US"TLS cache stat failed", strerror(saved_errno), NULL);
+    return tls_error(US"TLS cache stat failed", strerror(saved_errno), NULL, errstr);
     }
   if (!S_ISREG(statbuf.st_mode))
     {
     (void)close(fd);
-    return tls_error(US"TLS cache not a file", NULL, NULL);
+    return tls_error(US"TLS cache not a file", NULL, NULL, errstr);
     }
   if (!(fp = fdopen(fd, "rb")))
     {
     saved_errno = errno;
     (void)close(fd);
     return tls_error(US"fdopen(TLS cache stat fd) failed",
-        strerror(saved_errno), NULL);
+        strerror(saved_errno), NULL, errstr);
     }
 
   m.size = statbuf.st_size;
   if (!(m.data = malloc(m.size)))
     {
     fclose(fp);
-    return tls_error(US"malloc failed", strerror(errno), NULL);
+    return tls_error(US"malloc failed", strerror(errno), NULL, errstr);
     }
   if (!(sz = fread(m.data, m.size, 1, fp)))
     {
     saved_errno = errno;
     fclose(fp);
     free(m.data);
-    return tls_error(US"fread failed", strerror(saved_errno), NULL);
+    return tls_error(US"fread failed", strerror(saved_errno), NULL, errstr);
     }
   fclose(fp);
 
   rc = gnutls_dh_params_import_pkcs3(dh_server_params, &m, GNUTLS_X509_FMT_PEM);
   free(m.data);
-  exim_gnutls_err_check(US"gnutls_dh_params_import_pkcs3");
+  exim_gnutls_err_check(rc, US"gnutls_dh_params_import_pkcs3");
   DEBUG(D_tls) debug_printf("read D-H parameters from file \"%s\"\n", filename);
   }
 
@@ -604,7 +666,7 @@ else if (errno == ENOENT)
   }
 else
   return tls_error(string_open_failed(errno, "\"%s\" for reading", filename),
-      NULL, NULL);
+      NULL, NULL, errstr);
 
 /* If ret < 0, either the cache file does not exist, or the data it contains
 is not useful. One particular case of this is when upgrading from an older
@@ -619,11 +681,11 @@ if (rc < 0)
 
   if ((PATH_MAX - Ustrlen(filename)) < 10)
     return tls_error(US"Filename too long to generate replacement",
-        CS filename, NULL);
+        CS filename, NULL, errstr);
 
   temp_fn = string_copy(US "%s.XXXXXXX");
   if ((fd = mkstemp(CS temp_fn)) < 0)	/* modifies temp_fn */
-    return tls_error(US"Unable to open temp file", strerror(errno), NULL);
+    return tls_error(US"Unable to open temp file", strerror(errno), NULL, errstr);
   (void)fchown(fd, exim_uid, exim_gid);   /* Probably not necessary */
 
   /* GnuTLS overshoots!
@@ -646,7 +708,7 @@ if (rc < 0)
     debug_printf("requesting generation of %d bit Diffie-Hellman prime ...\n",
         dh_bits_gen);
   rc = gnutls_dh_params_generate2(dh_server_params, dh_bits_gen);
-  exim_gnutls_err_check(US"gnutls_dh_params_generate2");
+  exim_gnutls_err_check(rc, US"gnutls_dh_params_generate2");
 
   /* gnutls_dh_params_export_pkcs3() will tell us the exact size, every time,
   and I confirmed that a NULL call to get the size first is how the GnuTLS
@@ -657,10 +719,10 @@ if (rc < 0)
   rc = gnutls_dh_params_export_pkcs3(dh_server_params, GNUTLS_X509_FMT_PEM,
       m.data, &sz);
   if (rc != GNUTLS_E_SHORT_MEMORY_BUFFER)
-    exim_gnutls_err_check(US"gnutls_dh_params_export_pkcs3(NULL) sizing");
+    exim_gnutls_err_check(rc, US"gnutls_dh_params_export_pkcs3(NULL) sizing");
   m.size = sz;
   if (!(m.data = malloc(m.size)))
-    return tls_error(US"memory allocation failed", strerror(errno), NULL);
+    return tls_error(US"memory allocation failed", strerror(errno), NULL, errstr);
 
   /* this will return a size 1 less than the allocation size above */
   rc = gnutls_dh_params_export_pkcs3(dh_server_params, GNUTLS_X509_FMT_PEM,
@@ -668,7 +730,7 @@ if (rc < 0)
   if (rc != GNUTLS_E_SUCCESS)
     {
     free(m.data);
-    exim_gnutls_err_check(US"gnutls_dh_params_export_pkcs3() real");
+    exim_gnutls_err_check(rc, US"gnutls_dh_params_export_pkcs3() real");
     }
   m.size = sz; /* shrink by 1, probably */
 
@@ -676,19 +738,19 @@ if (rc < 0)
     {
     free(m.data);
     return tls_error(US"TLS cache write D-H params failed",
-        strerror(errno), NULL);
+        strerror(errno), NULL, errstr);
     }
   free(m.data);
   if ((sz = write_to_fd_buf(fd, US"\n", 1)) != 1)
     return tls_error(US"TLS cache write D-H params final newline failed",
-        strerror(errno), NULL);
+        strerror(errno), NULL, errstr);
 
   if ((rc = close(fd)))
-    return tls_error(US"TLS cache write close() failed", strerror(errno), NULL);
+    return tls_error(US"TLS cache write close() failed", strerror(errno), NULL, errstr);
 
   if (Urename(temp_fn, filename) < 0)
     return tls_error(string_sprintf("failed to rename \"%s\" as \"%s\"",
-          temp_fn, filename), strerror(errno), NULL);
+          temp_fn, filename), strerror(errno), NULL, errstr);
 
   DEBUG(D_tls) debug_printf("wrote D-H parameters to file \"%s\"\n", filename);
   }
@@ -703,7 +765,7 @@ return OK;
 /* Create and install a selfsigned certificate, for use in server mode */
 
 static int
-tls_install_selfsign(exim_gnutls_state_st * state)
+tls_install_selfsign(exim_gnutls_state_st * state, uschar ** errstr)
 {
 gnutls_x509_crt_t cert = NULL;
 time_t now;
@@ -761,13 +823,34 @@ out:
   return rc;
 
 err:
-  rc = tls_error(where, gnutls_strerror(rc), NULL);
+  rc = tls_error(where, gnutls_strerror(rc), NULL, errstr);
   goto out;
 }
 
 
 
 
+/* Add certificate and key, from files.
+
+Return:
+  Zero or negative: good.  Negate value for certificate index if < 0.
+  Greater than zero: FAIL or DEFER code.
+*/
+
+static int
+tls_add_certfile(exim_gnutls_state_st * state, const host_item * host,
+  uschar * certfile, uschar * keyfile, uschar ** errstr)
+{
+int rc = gnutls_certificate_set_x509_key_file(state->x509_cred,
+    CS certfile, CS keyfile, GNUTLS_X509_FMT_PEM);
+if (rc < 0)
+  return tls_error(
+    string_sprintf("cert/key setup: cert=%s key=%s", certfile, keyfile),
+    gnutls_strerror(rc), host, errstr);
+return -rc;
+}
+
+
 /*************************************************
 *       Variables re-expanded post-SNI           *
 *************************************************/
@@ -782,12 +865,13 @@ which we are responsible for setting on the first pass through.
 
 Arguments:
   state           exim_gnutls_state_st *
+  errstr	  error string pointer
 
 Returns:          OK/DEFER/FAIL
 */
 
 static int
-tls_expand_session_files(exim_gnutls_state_st *state)
+tls_expand_session_files(exim_gnutls_state_st * state, uschar ** errstr)
 {
 struct stat statbuf;
 int rc;
@@ -802,11 +886,11 @@ int cert_count;
 if (!host)	/* server */
   if (!state->received_sni)
     {
-    if (state->tls_certificate &&
-        (Ustrstr(state->tls_certificate, US"tls_sni") ||
-         Ustrstr(state->tls_certificate, US"tls_in_sni") ||
-         Ustrstr(state->tls_certificate, US"tls_out_sni")
-       ))
+    if (  state->tls_certificate
+       && (  Ustrstr(state->tls_certificate, US"tls_sni")
+	  || Ustrstr(state->tls_certificate, US"tls_in_sni")
+	  || Ustrstr(state->tls_certificate, US"tls_out_sni")
+       )  )
       {
       DEBUG(D_tls) debug_printf("We will re-expand TLS session files if we receive SNI.\n");
       state->trigger_sni_changes = TRUE;
@@ -822,7 +906,11 @@ if (!host)	/* server */
     }
 
 rc = gnutls_certificate_allocate_credentials(&state->x509_cred);
-exim_gnutls_err_check(US"gnutls_certificate_allocate_credentials");
+exim_gnutls_err_check(rc, US"gnutls_certificate_allocate_credentials");
+
+#ifdef SUPPORT_SRV_OCSP_STACK
+gnutls_certificate_set_flags(state->x509_cred, GNUTLS_CERTIFICATE_API_V2);
+#endif
 
 /* remember: expand_check_tlsvar() is expand_check() but fiddling with
 state members, assuming consistent naming; and expand_check() returns
@@ -831,7 +919,7 @@ false if expansion failed, unless expansion was forced to fail. */
 /* check if we at least have a certificate, before doing expensive
 D-H generation. */
 
-if (!expand_check_tlsvar(tls_certificate))
+if (!expand_check_tlsvar(tls_certificate, errstr))
   return DEFER;
 
 /* certificate is mandatory in server, optional in client */
@@ -840,11 +928,11 @@ if (  !state->exp_tls_certificate
    || !*state->exp_tls_certificate
    )
   if (!host)
-    return tls_install_selfsign(state);
+    return tls_install_selfsign(state, errstr);
   else
     DEBUG(D_tls) debug_printf("TLS: no client certificate specified; okay\n");
 
-if (state->tls_privatekey && !expand_check_tlsvar(tls_privatekey))
+if (state->tls_privatekey && !expand_check_tlsvar(tls_privatekey, errstr))
   return DEFER;
 
 /* tls_privatekey is optional, defaulting to same file as certificate */
@@ -873,44 +961,81 @@ if (state->exp_tls_certificate && *state->exp_tls_certificate)
       DEBUG(D_tls) debug_printf("TLS SNI: have a changed cert/key pair.\n");
       }
 
-  rc = gnutls_certificate_set_x509_key_file(state->x509_cred,
-      CS state->exp_tls_certificate, CS state->exp_tls_privatekey,
-      GNUTLS_X509_FMT_PEM);
-  exim_gnutls_err_check(
-      string_sprintf("cert/key setup: cert=%s key=%s",
-        state->exp_tls_certificate, state->exp_tls_privatekey));
-  DEBUG(D_tls) debug_printf("TLS: cert/key registered\n");
-  } /* tls_certificate */
+  if (!host)	/* server */
+    {
+    const uschar * clist = state->exp_tls_certificate;
+    const uschar * klist = state->exp_tls_privatekey;
+    const uschar * olist;
+    int csep = 0, ksep = 0, osep = 0, cnt = 0;
+    uschar * cfile, * kfile, * ofile;
+
+#ifndef DISABLE_OCSP
+    if (!expand_check(tls_ocsp_file, US"tls_ocsp_file", &ofile, errstr))
+      return DEFER;
+    olist = ofile;
+#endif
+
+    while (cfile = string_nextinlist(&clist, &csep, NULL, 0))
 
+      if (!(kfile = string_nextinlist(&klist, &ksep, NULL, 0)))
+	return tls_error(US"cert/key setup: out of keys", NULL, host, errstr);
+      else if (0 < (rc = tls_add_certfile(state, host, cfile, kfile, errstr)))
+	return rc;
+      else
+	{
+	int gnutls_cert_index = -rc;
+	DEBUG(D_tls) debug_printf("TLS: cert/key %s registered\n", cfile);
 
-/* Set the OCSP stapling server info */
+	/* Set the OCSP stapling server info */
 
 #ifndef DISABLE_OCSP
-if (  !host	/* server */
-   && tls_ocsp_file
-   )
-  {
-  if (gnutls_buggy_ocsp)
-    {
-    DEBUG(D_tls) debug_printf("GnuTLS library is buggy for OCSP; avoiding\n");
+	if (tls_ocsp_file)
+	  if (gnutls_buggy_ocsp)
+	    {
+	    DEBUG(D_tls)
+	      debug_printf("GnuTLS library is buggy for OCSP; avoiding\n");
+	    }
+	  else if ((ofile = string_nextinlist(&olist, &osep, NULL, 0)))
+	    {
+	    /* Use the full callback method for stapling just to get
+	    observability.  More efficient would be to read the file once only,
+	    if it never changed (due to SNI). Would need restart on file update,
+	    or watch datestamp.  */
+
+# ifdef SUPPORT_SRV_OCSP_STACK
+	    rc = gnutls_certificate_set_ocsp_status_request_function2(
+	      state->x509_cred, gnutls_cert_index,
+	      server_ocsp_stapling_cb, ofile);
+
+	    exim_gnutls_err_check(rc,
+	      US"gnutls_certificate_set_ocsp_status_request_function2");
+# else
+	    if (cnt++ > 0)
+	      {
+	      DEBUG(D_tls)
+		debug_printf("oops; multiple OCSP files not supported\n");
+	      break;
+	      }
+	      gnutls_certificate_set_ocsp_status_request_function(
+		state->x509_cred, server_ocsp_stapling_cb, ofile);
+# endif
+
+	    DEBUG(D_tls) debug_printf("OCSP response file = %s\n", ofile);
+	    }
+	  else
+	    DEBUG(D_tls) debug_printf("ran out of OCSP response files in list\n");
+#endif
+	}
     }
   else
     {
-    if (!expand_check(tls_ocsp_file, US"tls_ocsp_file",
-	  &state->exp_tls_ocsp_file))
-      return DEFER;
-
-    /* Use the full callback method for stapling just to get observability.
-    More efficient would be to read the file once only, if it never changed
-    (due to SNI). Would need restart on file update, or watch datestamp.  */
-
-    gnutls_certificate_set_ocsp_status_request_function(state->x509_cred,
-      server_ocsp_stapling_cb, state->exp_tls_ocsp_file);
-
-    DEBUG(D_tls) debug_printf("OCSP response file = %s\n", state->exp_tls_ocsp_file);
+    if (0 < (rc = tls_add_certfile(state, host,
+		state->exp_tls_certificate, state->exp_tls_privatekey, errstr)))
+      return rc;
+    DEBUG(D_tls) debug_printf("TLS: cert/key registered\n");
     }
-  }
-#endif
+
+  } /* tls_certificate */
 
 
 /* Set the trusted CAs file if one is provided, and then add the CRL if one is
@@ -921,14 +1046,14 @@ behaviour. */
 
 if (state->tls_verify_certificates && *state->tls_verify_certificates)
   {
-  if (!expand_check_tlsvar(tls_verify_certificates))
+  if (!expand_check_tlsvar(tls_verify_certificates, errstr))
     return DEFER;
 #ifndef SUPPORT_SYSDEFAULT_CABUNDLE
   if (Ustrcmp(state->exp_tls_verify_certificates, "system") == 0)
     state->exp_tls_verify_certificates = NULL;
 #endif
   if (state->tls_crl && *state->tls_crl)
-    if (!expand_check_tlsvar(tls_crl))
+    if (!expand_check_tlsvar(tls_crl, errstr))
       return DEFER;
 
   if (!(state->exp_tls_verify_certificates &&
@@ -1005,7 +1130,7 @@ else
 if (cert_count < 0)
   {
   rc = cert_count;
-  exim_gnutls_err_check(US"setting certificate trust");
+  exim_gnutls_err_check(rc, US"setting certificate trust");
   }
 DEBUG(D_tls) debug_printf("Added %d certificate authorities.\n", cert_count);
 
@@ -1018,7 +1143,7 @@ if (state->tls_crl && *state->tls_crl &&
   if (cert_count < 0)
     {
     rc = cert_count;
-    exim_gnutls_err_check(US"gnutls_certificate_set_x509_crl_file");
+    exim_gnutls_err_check(rc, US"gnutls_certificate_set_x509_crl_file");
     }
   DEBUG(D_tls) debug_printf("Processed %d CRLs.\n", cert_count);
   }
@@ -1041,12 +1166,13 @@ out to this.
 
 Arguments:
   state           exim_gnutls_state_st *
+  errstr	  error string pointer
 
 Returns:          OK/DEFER/FAIL
 */
 
 static int
-tls_set_remaining_x509(exim_gnutls_state_st *state)
+tls_set_remaining_x509(exim_gnutls_state_st *state, uschar ** errstr)
 {
 int rc;
 const host_item *host = state->host;  /* macro should be reconsidered? */
@@ -1059,7 +1185,7 @@ if (!state->host)
   {
   if (!dh_server_params)
     {
-    rc = init_server_dh();
+    rc = init_server_dh(errstr);
     if (rc != OK) return rc;
     }
   gnutls_certificate_set_dh_params(state->x509_cred, dh_server_params);
@@ -1068,7 +1194,7 @@ if (!state->host)
 /* Link the credentials to the session. */
 
 rc = gnutls_credentials_set(state->session, GNUTLS_CRD_CERTIFICATE, state->x509_cred);
-exim_gnutls_err_check(US"gnutls_credentials_set");
+exim_gnutls_err_check(rc, US"gnutls_credentials_set");
 
 return OK;
 }
@@ -1121,6 +1247,7 @@ Arguments:
   crl             CRL file
   require_ciphers tls_require_ciphers setting
   caller_state    returned state-info structure
+  errstr	  error string pointer
 
 Returns:          OK/DEFER/FAIL
 */
@@ -1134,7 +1261,8 @@ tls_init(
     const uschar *cas,
     const uschar *crl,
     const uschar *require_ciphers,
-    exim_gnutls_state_st **caller_state)
+    exim_gnutls_state_st **caller_state,
+    uschar ** errstr)
 {
 exim_gnutls_state_st *state;
 int rc;
@@ -1156,12 +1284,12 @@ if (!exim_gnutls_base_init_done)
   if (!gnutls_allow_auto_pkcs11)
     {
     rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL);
-    exim_gnutls_err_check(US"gnutls_pkcs11_init");
+    exim_gnutls_err_check(rc, US"gnutls_pkcs11_init");
     }
 #endif
 
   rc = gnutls_global_init();
-  exim_gnutls_err_check(US"gnutls_global_init");
+  exim_gnutls_err_check(rc, US"gnutls_global_init");
 
 #if EXIM_GNUTLS_LIBRARY_LOG_LEVEL >= 0
   DEBUG(D_tls)
@@ -1196,7 +1324,7 @@ else
   DEBUG(D_tls) debug_printf("initialising GnuTLS server session\n");
   rc = gnutls_init(&state->session, GNUTLS_SERVER);
   }
-exim_gnutls_err_check(US"gnutls_init");
+exim_gnutls_err_check(rc, US"gnutls_init");
 
 state->host = host;
 
@@ -1212,19 +1340,17 @@ that's tls_certificate, tls_privatekey, tls_verify_certificates, tls_crl */
 
 DEBUG(D_tls)
   debug_printf("Expanding various TLS configuration options for session credentials.\n");
-rc = tls_expand_session_files(state);
-if (rc != OK) return rc;
+if ((rc = tls_expand_session_files(state, errstr)) != OK) return rc;
 
 /* These are all other parts of the x509_cred handling, since SNI in GnuTLS
 requires a new structure afterwards. */
 
-rc = tls_set_remaining_x509(state);
-if (rc != OK) return rc;
+if ((rc = tls_set_remaining_x509(state, errstr)) != OK) return rc;
 
 /* set SNI in client, only */
 if (host)
   {
-  if (!expand_check(sni, US"tls_out_sni", &state->tlsp->sni))
+  if (!expand_check(sni, US"tls_out_sni", &state->tlsp->sni, errstr))
     return DEFER;
   if (state->tlsp->sni && *state->tlsp->sni)
     {
@@ -1233,12 +1359,12 @@ if (host)
     sz = Ustrlen(state->tlsp->sni);
     rc = gnutls_server_name_set(state->session,
         GNUTLS_NAME_DNS, state->tlsp->sni, sz);
-    exim_gnutls_err_check(US"gnutls_server_name_set");
+    exim_gnutls_err_check(rc, US"gnutls_server_name_set");
     }
   }
 else if (state->tls_sni)
   DEBUG(D_tls) debug_printf("*** PROBABLY A BUG *** " \
-      "have an SNI set for a client [%s]\n", state->tls_sni);
+      "have an SNI set for a server [%s]\n", state->tls_sni);
 
 /* This is the priority string support,
 http://www.gnutls.org/manual/html_node/Priority-Strings.html
@@ -1250,7 +1376,7 @@ want_default_priorities = TRUE;
 
 if (state->tls_require_ciphers && *state->tls_require_ciphers)
   {
-  if (!expand_check_tlsvar(tls_require_ciphers))
+  if (!expand_check_tlsvar(tls_require_ciphers, errstr))
     return DEFER;
   if (state->exp_tls_require_ciphers && *state->exp_tls_require_ciphers)
     {
@@ -1273,12 +1399,12 @@ if (want_default_priorities)
   p = US exim_default_gnutls_priority;
   }
 
-exim_gnutls_err_check(string_sprintf(
+exim_gnutls_err_check(rc, string_sprintf(
       "gnutls_priority_init(%s) failed at offset %ld, \"%.6s..\"",
       p, errpos - CS p, errpos));
 
 rc = gnutls_priority_set(state->session, state->priority_cache);
-exim_gnutls_err_check(US"gnutls_priority_set");
+exim_gnutls_err_check(rc, US"gnutls_priority_set");
 
 gnutls_db_set_cache_expiration(state->session, ssl_session_timeout);
 
@@ -1324,12 +1450,13 @@ don't apply.
 
 Arguments:
   state           exim_gnutls_state_st *
+  errstr	  pointer to error string
 
 Returns:          OK/DEFER/FAIL
 */
 
 static int
-peer_status(exim_gnutls_state_st *state)
+peer_status(exim_gnutls_state_st *state, uschar ** errstr)
 {
 uschar cipherbuf[256];
 const gnutls_datum_t *cert_list;
@@ -1383,7 +1510,7 @@ if (cert_list == NULL || cert_list_size == 0)
       cert_list, cert_list_size);
   if (state->verify_requirement >= VERIFY_REQUIRED)
     return tls_error(US"certificate verification failed",
-        "no certificate received from peer", state->host);
+        "no certificate received from peer", state->host, errstr);
   return OK;
   }
 
@@ -1395,7 +1522,7 @@ if (ct != GNUTLS_CRT_X509)
     debug_printf("TLS: peer cert not X.509 but instead \"%s\"\n", ctn);
   if (state->verify_requirement >= VERIFY_REQUIRED)
     return tls_error(US"certificate verification not possible, unhandled type",
-        ctn, state->host);
+        ctn, state->host, errstr);
   return OK;
   }
 
@@ -1406,7 +1533,7 @@ if (ct != GNUTLS_CRT_X509)
       DEBUG(D_tls) debug_printf("TLS: peer cert problem: %s: %s\n", \
 	(Label), gnutls_strerror(rc)); \
       if (state->verify_requirement >= VERIFY_REQUIRED) \
-	return tls_error((Label), gnutls_strerror(rc), state->host); \
+	return tls_error((Label), gnutls_strerror(rc), state->host, errstr); \
       return OK; \
       } \
     } while (0)
@@ -1446,8 +1573,8 @@ gnutls_certificate_set_verify_function() to fail the handshake if we dislike
 the peer information, but that's too new for some OSes.
 
 Arguments:
-  state           exim_gnutls_state_st *
-  error           where to put an error message
+  state		exim_gnutls_state_st *
+  errstr	where to put an error message
 
 Returns:
   FALSE     if the session should be rejected
@@ -1455,43 +1582,157 @@ Returns:
 */
 
 static BOOL
-verify_certificate(exim_gnutls_state_st *state, const char **error)
+verify_certificate(exim_gnutls_state_st * state, uschar ** errstr)
 {
 int rc;
-unsigned int verify;
+uint verify;
 
-*error = NULL;
+if (state->verify_requirement == VERIFY_NONE)
+  return TRUE;
 
-if ((rc = peer_status(state)) != OK)
+*errstr = NULL;
+
+if ((rc = peer_status(state, errstr)) != OK)
   {
   verify = GNUTLS_CERT_INVALID;
-  *error = "certificate not supplied";
+  *errstr = US"certificate not supplied";
   }
 else
+
+  {
+#ifdef SUPPORT_DANE
+  if (state->verify_requirement == VERIFY_DANE && state->host)
+    {
+    /* Using dane_verify_session_crt() would be easy, as it does it all for us
+    including talking to a DNS resolver.  But we want to do that bit ourselves
+    as the testsuite intercepts and fakes its own DNS environment. */
+
+    dane_state_t s;
+    dane_query_t r;
+    uint lsize;
+    const gnutls_datum_t * certlist =
+      gnutls_certificate_get_peers(state->session, &lsize);
+    int usage = tls_out.tlsa_usage;
+
+# ifdef GNUTLS_BROKEN_DANE_VALIDATION
+    /* Split the TLSA records into two sets, TA and EE selectors.  Run the
+    dane-verification separately so that we know which selector verified;
+    then we know whether to do CA-chain-verification and name-verification
+    (needed for TA but not EE). */
+
+    if (usage == ((1<<DANESSL_USAGE_DANE_TA) | (1<<DANESSL_USAGE_DANE_EE)))
+    {						/* a mixed-usage bundle */
+      int i, j, nrec;
+      const char ** dd;
+      int * ddl;
+
+      for(nrec = 0; state->dane_data_len[nrec]; ) nrec++;
+      nrec++;
+
+      dd = store_get(nrec * sizeof(uschar *));
+      ddl = store_get(nrec * sizeof(int));
+      nrec--;
+
+      if ((rc = dane_state_init(&s, 0)))
+	goto tlsa_prob;
+
+      for (usage = DANESSL_USAGE_DANE_EE;
+	   usage >= DANESSL_USAGE_DANE_TA; usage--)
+	{				/* take records with this usage */
+	for (j = i = 0; i < nrec; i++)
+	  if (state->dane_data[i][0] == usage)
+	    {
+	    dd[j] = state->dane_data[i];
+	    ddl[j++] = state->dane_data_len[i];
+	    }
+	if (j)
+	  {
+	  dd[j] = NULL;
+	  ddl[j] = 0;
+
+	  if ((rc = dane_raw_tlsa(s, &r, (char * const *)dd, ddl, 1, 0)))
+	    goto tlsa_prob;
+
+	  if ((rc = dane_verify_crt_raw(s, certlist, lsize,
+			    gnutls_certificate_type_get(state->session),
+			    r, 0,
+			    usage == DANESSL_USAGE_DANE_EE
+			    ? DANE_VFLAG_ONLY_CHECK_EE_USAGE : 0,
+			    &verify)))
+	    {
+	    DEBUG(D_tls)
+	      debug_printf("TLSA record problem: %s\n", dane_strerror(rc));
+	    }
+	  else if (verify == 0)	/* verification passed */
+	    {
+	    usage = 1 << usage;
+	    break;
+	    }
+	  }
+	}
+
+	if (rc) goto tlsa_prob;
+      }
+    else
+# endif
+      {
+      if (  (rc = dane_state_init(&s, 0))
+	 || (rc = dane_raw_tlsa(s, &r, state->dane_data, state->dane_data_len,
+			1, 0))
+	 || (rc = dane_verify_crt_raw(s, certlist, lsize,
+			gnutls_certificate_type_get(state->session),
+			r, 0, 
+# ifdef GNUTLS_BROKEN_DANE_VALIDATION
+			usage == (1 << DANESSL_USAGE_DANE_EE)
+			? DANE_VFLAG_ONLY_CHECK_EE_USAGE : 0,
+# else
+			0,
+# endif
+			&verify))
+	 )
+	goto tlsa_prob;
+      }
+
+    if (verify != 0)		/* verification failed */
+      {
+      gnutls_datum_t str;
+      (void) dane_verification_status_print(verify, &str, 0);
+      *errstr = US str.data;	/* don't bother to free */
+      goto badcert;
+      }
+    state->peer_dane_verified = TRUE;
+
+# ifdef GNUTLS_BROKEN_DANE_VALIDATION
+    /* If a TA-mode TLSA record was used for verification we must additionally
+    verify the CA chain and the cert name.  For EE-mode, skip it. */
+
+    if (usage & (1 << DANESSL_USAGE_DANE_EE))
+# endif
+      {
+      state->peer_cert_verified = TRUE;
+      goto goodcert;
+      }
+    }
+#endif
+
   rc = gnutls_certificate_verify_peers2(state->session, &verify);
+  }
 
-/* Handle the result of verification. INVALID seems to be set as well
-as REVOKED, but leave the test for both. */
+/* Handle the result of verification. INVALID is set if any others are. */
 
-if (rc < 0 ||
-    verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED)
-   )
+if (rc < 0 || verify & (GNUTLS_CERT_INVALID|GNUTLS_CERT_REVOKED))
   {
   state->peer_cert_verified = FALSE;
-  if (!*error)
-    *error = verify & GNUTLS_CERT_REVOKED
-      ? "certificate revoked" : "certificate invalid";
+  if (!*errstr)
+    *errstr = verify & GNUTLS_CERT_REVOKED
+      ? US"certificate revoked" : US"certificate invalid";
 
   DEBUG(D_tls)
     debug_printf("TLS certificate verification failed (%s): peerdn=\"%s\"\n",
-        *error, state->peerdn ? state->peerdn : US"<unset>");
+        *errstr, state->peerdn ? state->peerdn : US"<unset>");
 
   if (state->verify_requirement >= VERIFY_REQUIRED)
-    {
-    gnutls_alert_send(state->session,
-      GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE);
-    return FALSE;
-    }
+    goto badcert;
   DEBUG(D_tls)
     debug_printf("TLS verify failure overridden (host in tls_try_verify_hosts)\n");
   }
@@ -1511,11 +1752,7 @@ else
       DEBUG(D_tls)
 	debug_printf("TLS certificate verification failed: cert name mismatch\n");
       if (state->verify_requirement >= VERIFY_REQUIRED)
-	{
-	gnutls_alert_send(state->session,
-	  GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE);
-	return FALSE;
-	}
+	goto badcert;
       return TRUE;
       }
     }
@@ -1524,9 +1761,18 @@ else
       state->peerdn ? state->peerdn : US"<unset>");
   }
 
-state->tlsp->peerdn = state->peerdn;
+goodcert:
+  state->tlsp->peerdn = state->peerdn;
+  return TRUE;
 
-return TRUE;
+#ifdef SUPPORT_DANE
+tlsa_prob:
+  *errstr = string_sprintf("TLSA record problem: %s", dane_strerror(rc));
+#endif
+
+badcert:
+  gnutls_alert_send(state->session, GNUTLS_AL_FATAL, GNUTLS_A_BAD_CERTIFICATE);
+  return FALSE;
 }
 
 
@@ -1579,6 +1825,7 @@ size_t data_len = MAX_HOST_LEN;
 exim_gnutls_state_st *state = &state_server;
 unsigned int sni_type;
 int rc, old_pool;
+uschar * dummy_errstr;
 
 rc = gnutls_server_name_get(session, sni_name, &data_len, &sni_type, 0);
 if (rc != GNUTLS_E_SUCCESS)
@@ -1589,7 +1836,7 @@ if (rc != GNUTLS_E_SUCCESS)
     else
       debug_printf("TLS failure: gnutls_server_name_get(): %s [%d]\n",
         gnutls_strerror(rc), rc);
-  };
+    }
   return 0;
   }
 
@@ -1614,15 +1861,14 @@ DEBUG(D_tls) debug_printf("Received TLS SNI \"%s\"%s\n", sni_name,
 if (!state->trigger_sni_changes)
   return 0;
 
-rc = tls_expand_session_files(state);
-if (rc != OK)
+if ((rc = tls_expand_session_files(state, &dummy_errstr)) != OK)
   {
   /* If the setup of certs/etc failed before handshake, TLS would not have
   been offered.  The best we can do now is abort. */
   return GNUTLS_E_APPLICATION_ERROR_MIN;
   }
 
-rc = tls_set_remaining_x509(state);
+rc = tls_set_remaining_x509(state, &dummy_errstr);
 if (rc != OK) return GNUTLS_E_APPLICATION_ERROR_MIN;
 
 return 0;
@@ -1637,11 +1883,12 @@ server_ocsp_stapling_cb(gnutls_session_t session, void * ptr,
   gnutls_datum_t * ocsp_response)
 {
 int ret;
+DEBUG(D_tls) debug_printf("OCSP stapling callback: %s\n", US ptr);
 
 if ((ret = gnutls_load_file(ptr, ocsp_response)) < 0)
   {
   DEBUG(D_tls) debug_printf("Failed to load ocsp stapling file %s\n",
-			      (char *)ptr);
+			      CS ptr);
   tls_in.ocsp = OCSP_NOT_RESP;
   return GNUTLS_E_NO_CERTIFICATE_STATUS;
   }
@@ -1720,6 +1967,7 @@ a TLS session.
 
 Arguments:
   require_ciphers  list of allowed ciphers or NULL
+  errstr	   pointer to error string
 
 Returns:           OK on success
                    DEFER for errors before the start of the negotiation
@@ -1728,17 +1976,16 @@ Returns:           OK on success
 */
 
 int
-tls_server_start(const uschar *require_ciphers)
+tls_server_start(const uschar * require_ciphers, uschar ** errstr)
 {
 int rc;
-const char *error;
-exim_gnutls_state_st *state = NULL;
+exim_gnutls_state_st * state = NULL;
 
 /* Check for previous activation */
 if (tls_in.active >= 0)
   {
-  tls_error(US"STARTTLS received after TLS started", "", NULL);
-  smtp_printf("554 Already in TLS\r\n");
+  tls_error(US"STARTTLS received after TLS started", "", NULL, errstr);
+  smtp_printf("554 Already in TLS\r\n", FALSE);
   return FAIL;
   }
 
@@ -1747,10 +1994,9 @@ and sent an SMTP response. */
 
 DEBUG(D_tls) debug_printf("initialising GnuTLS as a server\n");
 
-rc = tls_init(NULL, tls_certificate, tls_privatekey,
+if ((rc = tls_init(NULL, tls_certificate, tls_privatekey,
     NULL, tls_verify_certificates, tls_crl,
-    require_ciphers, &state);
-if (rc != OK) return rc;
+    require_ciphers, &state, errstr)) != OK) return rc;
 
 /* If this is a host for which certificate verification is mandatory or
 optional, set up appropriately. */
@@ -1800,7 +2046,7 @@ mode, the fflush() happens when smtp_getc() is called. */
 
 if (!state->tlsp->on_connect)
   {
-  smtp_printf("220 TLS go ahead\r\n");
+  smtp_printf("220 TLS go ahead\r\n", FALSE);
   fflush(smtp_out);
   }
 
@@ -1828,12 +2074,12 @@ if (rc != GNUTLS_E_SUCCESS)
 
   if (sigalrm_seen)
     {
-    tls_error(US"gnutls_handshake", "timed out", NULL);
+    tls_error(US"gnutls_handshake", "timed out", NULL, errstr);
     gnutls_db_remove_session(state->session);
     }
   else
     {
-    tls_error(US"gnutls_handshake", gnutls_strerror(rc), NULL);
+    tls_error(US"gnutls_handshake", gnutls_strerror(rc), NULL, errstr);
     (void) gnutls_alert_send_appropriate(state->session, rc);
     gnutls_deinit(state->session);
     gnutls_certificate_free_credentials(state->x509_cred);
@@ -1852,22 +2098,21 @@ DEBUG(D_tls) debug_printf("gnutls_handshake was successful\n");
 
 /* Verify after the fact */
 
-if (  state->verify_requirement != VERIFY_NONE
-   && !verify_certificate(state, &error))
+if (!verify_certificate(state, errstr))
   {
   if (state->verify_requirement != VERIFY_OPTIONAL)
     {
-    tls_error(US"certificate verification failed", error, NULL);
+    (void) tls_error(US"certificate verification failed", *errstr, NULL, errstr);
     return FAIL;
     }
   DEBUG(D_tls)
     debug_printf("TLS: continuing on only because verification was optional, after: %s\n",
-	error);
+	*errstr);
   }
 
 /* Figure out peer DN, and if authenticated, etc. */
 
-if ((rc = peer_status(state)) != OK) return rc;
+if ((rc = peer_status(state, NULL)) != OK) return rc;
 
 /* Sets various Exim expansion variables; always safe within server */
 
@@ -1879,6 +2124,7 @@ and initialize appropriately. */
 state->xfer_buffer = store_malloc(ssl_xfer_buffer_size);
 
 receive_getc = tls_getc;
+receive_getbuf = tls_getbuf;
 receive_get_cache = tls_get_cache;
 receive_ungetc = tls_ungetc;
 receive_feof = tls_feof;
@@ -1910,6 +2156,77 @@ if (verify_check_given_host(&ob->tls_verify_cert_hostnames, host) == OK)
 }
 
 
+
+
+#ifdef SUPPORT_DANE
+/* Given our list of RRs from the TLSA lookup, build a lookup block in
+GnuTLS-DANE's preferred format.  Hang it on the state str for later
+use in DANE verification.
+
+We point at the dnsa data not copy it, so it must remain valid until
+after verification is done.*/
+
+static BOOL
+dane_tlsa_load(exim_gnutls_state_st * state, dns_answer * dnsa)
+{
+dns_record * rr;
+dns_scan dnss;
+int i;
+const char **	dane_data;
+int *		dane_data_len;
+
+for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS), i = 1;
+     rr;
+     rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)
+    ) if (rr->type == T_TLSA) i++;
+
+dane_data = store_get(i * sizeof(uschar *));
+dane_data_len = store_get(i * sizeof(int));
+
+for (rr = dns_next_rr(dnsa, &dnss, RESET_ANSWERS), i = 0;
+     rr;
+     rr = dns_next_rr(dnsa, &dnss, RESET_NEXT)
+    ) if (rr->type == T_TLSA)
+  {
+  const uschar * p = rr->data;
+  uint8_t usage = p[0], sel = p[1], type = p[2];
+
+  DEBUG(D_tls)
+    debug_printf("TLSA: %d %d %d size %d\n", usage, sel, type, rr->size);
+
+  if (  (usage != DANESSL_USAGE_DANE_TA && usage != DANESSL_USAGE_DANE_EE)
+     || (sel != 0 && sel != 1)
+     )
+    continue;
+  switch(type)
+    {
+    case 0:	/* Full: cannot check at present */
+		break;
+    case 1:	if (rr->size != 3 + 256/8) continue;	/* sha2-256 */
+		break;
+    case 2:	if (rr->size != 3 + 512/8) continue;	/* sha2-512 */
+		break;
+    default:	continue;
+    }
+
+  tls_out.tlsa_usage |= 1<<usage;
+  dane_data[i] = p;
+  dane_data_len[i++] = rr->size;
+  }
+
+if (!i) return FALSE;
+
+dane_data[i] = NULL;
+dane_data_len[i] = 0;
+
+state->dane_data = (char * const *)dane_data;
+state->dane_data_len = dane_data_len;
+return TRUE;
+}
+#endif
+
+
+
 /*************************************************
 *    Start a TLS session in a client             *
 *************************************************/
@@ -1921,6 +2238,12 @@ Arguments:
   host              connected host (for messages)
   addr              the first address (not used)
   tb                transport (always smtp)
+  tlsa_dnsa	    non-NULL, either request or require dane for this host, and
+		    a TLSA record found.  Therefore, dane verify required.
+		    Which implies cert must be requested and supplied, dane
+		    verify must pass, and cert verify irrelevant (incl.
+		    hostnames), and (caller handled) require_tls
+  errstr	    error string pointer
 
 Returns:            OK/DEFER/FAIL (because using common functions),
                     but for a client, DEFER and FAIL have the same meaning
@@ -1929,17 +2252,16 @@ Returns:            OK/DEFER/FAIL (because using common functions),
 int
 tls_client_start(int fd, host_item *host,
     address_item *addr ARG_UNUSED,
-    transport_instance *tb
-#ifdef EXPERIMENTAL_DANE
-    , dns_answer * unused_tlsa_dnsa
+    transport_instance * tb,
+#ifdef SUPPORT_DANE
+    dns_answer * tlsa_dnsa,
 #endif
-    )
+    uschar ** errstr)
 {
 smtp_transport_options_block *ob =
   (smtp_transport_options_block *)tb->options_block;
 int rc;
-const char *error;
-exim_gnutls_state_st *state = NULL;
+exim_gnutls_state_st * state = NULL;
 #ifndef DISABLE_OCSP
 BOOL require_ocsp =
   verify_check_given_host(&ob->hosts_require_ocsp, host) == OK;
@@ -1951,7 +2273,7 @@ DEBUG(D_tls) debug_printf("initialising GnuTLS as a client on fd %d\n", fd);
 
 if ((rc = tls_init(host, ob->tls_certificate, ob->tls_privatekey,
     ob->tls_sni, ob->tls_verify_certificates, ob->tls_crl,
-    ob->tls_require_ciphers, &state)) != OK)
+    ob->tls_require_ciphers, &state, errstr)) != OK)
   return rc;
 
   {
@@ -1975,12 +2297,22 @@ if ((rc = tls_init(host, ob->tls_certificate, ob->tls_privatekey,
 set but both tls_verify_hosts and tls_try_verify_hosts are unset. Check only
 the specified host patterns if one of them is defined */
 
-if (  (  state->exp_tls_verify_certificates
-      && !ob->tls_verify_hosts
-      && (!ob->tls_try_verify_hosts || !*ob->tls_try_verify_hosts)
-      )
-    || verify_check_given_host(&ob->tls_verify_hosts, host) == OK
-   )
+#ifdef SUPPORT_DANE
+if (tlsa_dnsa && dane_tlsa_load(state, tlsa_dnsa))
+  {
+  DEBUG(D_tls)
+    debug_printf("TLS: server certificate DANE required.\n");
+  state->verify_requirement = VERIFY_DANE;
+  gnutls_certificate_server_set_request(state->session, GNUTLS_CERT_REQUIRE);
+  }
+else
+#endif
+    if (  (  state->exp_tls_verify_certificates
+	  && !ob->tls_verify_hosts
+	  && (!ob->tls_try_verify_hosts || !*ob->tls_try_verify_hosts)
+	  )
+	|| verify_check_given_host(&ob->tls_verify_hosts, host) == OK
+       )
   {
   tls_client_setup_hostname_checks(host, state, ob);
   DEBUG(D_tls)
@@ -2012,7 +2344,7 @@ if (request_ocsp)
   if ((rc = gnutls_ocsp_status_request_enable_client(state->session,
 		    NULL, 0, NULL)) != OK)
     return tls_error(US"cert-status-req",
-		    gnutls_strerror(rc), state->host);
+		    gnutls_strerror(rc), state->host, errstr);
   tls_out.ocsp = OCSP_NOT_RESP;
   }
 #endif
@@ -2036,28 +2368,25 @@ DEBUG(D_tls) debug_printf("about to gnutls_handshake\n");
 sigalrm_seen = FALSE;
 alarm(ob->command_timeout);
 do
-  {
   rc = gnutls_handshake(state->session);
-  } while ((rc == GNUTLS_E_AGAIN) ||
-      (rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen));
+while (rc == GNUTLS_E_AGAIN || rc == GNUTLS_E_INTERRUPTED && !sigalrm_seen);
 alarm(0);
 
 if (rc != GNUTLS_E_SUCCESS)
   if (sigalrm_seen)
     {
     gnutls_alert_send(state->session, GNUTLS_AL_FATAL, GNUTLS_A_USER_CANCELED);
-    return tls_error(US"gnutls_handshake", "timed out", state->host);
+    return tls_error(US"gnutls_handshake", "timed out", state->host, errstr);
     }
   else
-    return tls_error(US"gnutls_handshake", gnutls_strerror(rc), state->host);
+    return tls_error(US"gnutls_handshake", gnutls_strerror(rc), state->host, errstr);
 
 DEBUG(D_tls) debug_printf("gnutls_handshake was successful\n");
 
 /* Verify late */
 
-if (state->verify_requirement != VERIFY_NONE &&
-    !verify_certificate(state, &error))
-  return tls_error(US"certificate verification failed", error, state->host);
+if (!verify_certificate(state, errstr))
+  return tls_error(US"certificate verification failed", *errstr, state->host, errstr);
 
 #ifndef DISABLE_OCSP
 if (require_ocsp)
@@ -2077,13 +2406,13 @@ if (require_ocsp)
       gnutls_free(printed.data);
       }
     else
-      (void) tls_error(US"ocsp decode", gnutls_strerror(rc), state->host);
+      (void) tls_error(US"ocsp decode", gnutls_strerror(rc), state->host, errstr);
     }
 
   if (gnutls_ocsp_status_request_is_checked(state->session, 0) == 0)
     {
     tls_out.ocsp = OCSP_FAILED;
-    return tls_error(US"certificate status check failed", NULL, state->host);
+    return tls_error(US"certificate status check failed", NULL, state->host, errstr);
     }
   DEBUG(D_tls) debug_printf("Passed OCSP checking\n");
   tls_out.ocsp = OCSP_VFIED;
@@ -2092,7 +2421,7 @@ if (require_ocsp)
 
 /* Figure out peer DN, and if authenticated, etc. */
 
-if ((rc = peer_status(state)) != OK)
+if ((rc = peer_status(state, errstr)) != OK)
   return rc;
 
 /* Sets various Exim expansion variables; may need to adjust for ACL callouts */
@@ -2142,12 +2471,81 @@ if ((state_server.session == NULL) && (state_client.session == NULL))
   gnutls_global_deinit();
   exim_gnutls_base_init_done = FALSE;
   }
-
 }
 
 
 
 
+static BOOL
+tls_refill(unsigned lim)
+{
+exim_gnutls_state_st * state = &state_server;
+ssize_t inbytes;
+
+DEBUG(D_tls) debug_printf("Calling gnutls_record_recv(%p, %p, %u)\n",
+  state->session, state->xfer_buffer, ssl_xfer_buffer_size);
+
+sigalrm_seen = FALSE;
+if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
+inbytes = gnutls_record_recv(state->session, state->xfer_buffer,
+  MIN(ssl_xfer_buffer_size, lim));
+alarm(0);
+
+/* Timeouts do not get this far; see command_timeout_handler().
+   A zero-byte return appears to mean that the TLS session has been
+   closed down, not that the socket itself has been closed down. Revert to
+   non-TLS handling. */
+
+if (sigalrm_seen)
+  {
+  DEBUG(D_tls) debug_printf("Got tls read timeout\n");
+  state->xfer_error = 1;
+  return FALSE;
+  }
+
+else if (inbytes == 0)
+  {
+  DEBUG(D_tls) debug_printf("Got TLS_EOF\n");
+
+  receive_getc = smtp_getc;
+  receive_getbuf = smtp_getbuf;
+  receive_get_cache = smtp_get_cache;
+  receive_ungetc = smtp_ungetc;
+  receive_feof = smtp_feof;
+  receive_ferror = smtp_ferror;
+  receive_smtp_buffered = smtp_buffered;
+
+  gnutls_deinit(state->session);
+  gnutls_certificate_free_credentials(state->x509_cred);
+
+  state->session = NULL;
+  state->tlsp->active = -1;
+  state->tlsp->bits = 0;
+  state->tlsp->certificate_verified = FALSE;
+  tls_channelbinding_b64 = NULL;
+  state->tlsp->cipher = NULL;
+  state->tlsp->peercert = NULL;
+  state->tlsp->peerdn = NULL;
+
+  return FALSE;
+  }
+
+/* Handle genuine errors */
+
+else if (inbytes < 0)
+  {
+  record_io_error(state, (int) inbytes, US"recv", NULL);
+  state->xfer_error = 1;
+  return FALSE;
+  }
+#ifndef DISABLE_DKIM
+dkim_exim_verify_feed(state->xfer_buffer, inbytes);
+#endif
+state->xfer_buffer_hwm = (int) inbytes;
+state->xfer_buffer_lwm = 0;
+return TRUE;
+}
+
 /*************************************************
 *            TLS version of getc                 *
 *************************************************/
@@ -2158,84 +2556,48 @@ Only used by the server-side TLS.
 
 This feeds DKIM and should be used for all message-body reads.
 
-Arguments:  none
+Arguments:  lim		Maximum amount to read/bufffer
 Returns:    the next character or EOF
 */
 
 int
-tls_getc(void)
+tls_getc(unsigned lim)
 {
-exim_gnutls_state_st *state = &state_server;
-if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm)
-  {
-  ssize_t inbytes;
-
-  DEBUG(D_tls) debug_printf("Calling gnutls_record_recv(%p, %p, %u)\n",
-    state->session, state->xfer_buffer, ssl_xfer_buffer_size);
-
-  if (smtp_receive_timeout > 0) alarm(smtp_receive_timeout);
-  inbytes = gnutls_record_recv(state->session, state->xfer_buffer,
-    ssl_xfer_buffer_size);
-  alarm(0);
-
-  /* Timeouts do not get this far; see command_timeout_handler().
-     A zero-byte return appears to mean that the TLS session has been
-     closed down, not that the socket itself has been closed down. Revert to
-     non-TLS handling. */
-
-  if (sigalrm_seen)
-    {
-    DEBUG(D_tls) debug_printf("Got tls read timeout\n");
-    state->xfer_error = 1;
-    return EOF;
-    }
-
-  else if (inbytes == 0)
-    {
-    DEBUG(D_tls) debug_printf("Got TLS_EOF\n");
-
-    receive_getc = smtp_getc;
-    receive_get_cache = smtp_get_cache;
-    receive_ungetc = smtp_ungetc;
-    receive_feof = smtp_feof;
-    receive_ferror = smtp_ferror;
-    receive_smtp_buffered = smtp_buffered;
+exim_gnutls_state_st * state = &state_server;
 
-    gnutls_deinit(state->session);
-    gnutls_certificate_free_credentials(state->x509_cred);
+if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm)
+  if (!tls_refill(lim))
+    return state->xfer_error ? EOF : smtp_getc(lim);
 
-    state->session = NULL;
-    state->tlsp->active = -1;
-    state->tlsp->bits = 0;
-    state->tlsp->certificate_verified = FALSE;
-    tls_channelbinding_b64 = NULL;
-    state->tlsp->cipher = NULL;
-    state->tlsp->peercert = NULL;
-    state->tlsp->peerdn = NULL;
+/* Something in the buffer; return next uschar */
 
-    return smtp_getc();
-    }
+return state->xfer_buffer[state->xfer_buffer_lwm++];
+}
 
-  /* Handle genuine errors */
+uschar *
+tls_getbuf(unsigned * len)
+{
+exim_gnutls_state_st * state = &state_server;
+unsigned size;
+uschar * buf;
 
-  else if (inbytes < 0)
+if (state->xfer_buffer_lwm >= state->xfer_buffer_hwm)
+  if (!tls_refill(*len))
     {
-    record_io_error(state, (int) inbytes, US"recv", NULL);
-    state->xfer_error = 1;
-    return EOF;
+    if (!state->xfer_error) return smtp_getbuf(len);
+    *len = 0;
+    return NULL;
     }
-#ifndef DISABLE_DKIM
-  dkim_exim_verify_feed(state->xfer_buffer, inbytes);
-#endif
-  state->xfer_buffer_hwm = (int) inbytes;
-  state->xfer_buffer_lwm = 0;
-  }
 
-/* Something in the buffer; return next uschar */
-
-return state->xfer_buffer[state->xfer_buffer_lwm++];
+if ((size = state->xfer_buffer_hwm - state->xfer_buffer_lwm) > *len)
+  size = *len;
+buf = &state->xfer_buffer[state->xfer_buffer_lwm];
+state->xfer_buffer_lwm += size;
+*len = size;
+return buf;
 }
 
+
 void
 tls_get_cache()
 {
@@ -2248,6 +2610,14 @@ if (n > 0)
 }
 
 
+BOOL
+tls_could_read(void)
+{
+return state_server.xfer_buffer_lwm < state_server.xfer_buffer_hwm
+ || gnutls_record_check_pending(state_server.session) > 0;
+}
+
+
 
 
 /*************************************************
@@ -2307,19 +2677,27 @@ Arguments:
   is_server channel specifier
   buff      buffer of data
   len       number of bytes
+  more	    more data expected soon
 
 Returns:    the number of bytes after a successful write,
             -1 after a failed write
 */
 
 int
-tls_write(BOOL is_server, const uschar *buff, size_t len)
+tls_write(BOOL is_server, const uschar *buff, size_t len, BOOL more)
 {
 ssize_t outbytes;
 size_t left = len;
 exim_gnutls_state_st *state = is_server ? &state_server : &state_client;
+#ifdef SUPPORT_CORK
+static BOOL corked = FALSE;
+
+if (more && !corked) gnutls_record_cork(state->session);
+#endif
+
+DEBUG(D_tls) debug_printf("%s(%p, " SIZE_T_FMT "%s)\n", __FUNCTION__,
+  buff, left, more ? ", more" : "");
 
-DEBUG(D_tls) debug_printf("tls_do_write(%p, " SIZE_T_FMT ")\n", buff, left);
 while (left > 0)
   {
   DEBUG(D_tls) debug_printf("gnutls_record_send(SSL, %p, " SIZE_T_FMT ")\n",
@@ -2350,6 +2728,14 @@ if (len > INT_MAX)
   len = INT_MAX;
   }
 
+#ifdef SUPPORT_CORK
+if (more != corked)
+  {
+  if (!more) (void) gnutls_record_uncork(state->session, 0);
+  corked = more;
+  }
+#endif
+
 return (int) len;
 }
 
@@ -2437,6 +2823,7 @@ int rc;
 uschar *expciphers = NULL;
 gnutls_priority_t priority_cache;
 const char *errpos;
+uschar * dummy_errstr;
 
 #define validate_check_rc(Label) do { \
   if (rc != GNUTLS_E_SUCCESS) { if (exim_gnutls_base_init_done) gnutls_global_deinit(); \
@@ -2461,7 +2848,8 @@ exim_gnutls_base_init_done = TRUE;
 if (!(tls_require_ciphers && *tls_require_ciphers))
   return_deinit(NULL);
 
-if (!expand_check(tls_require_ciphers, US"tls_require_ciphers", &expciphers))
+if (!expand_check(tls_require_ciphers, US"tls_require_ciphers", &expciphers,
+		  &dummy_errstr))
   return_deinit(US"failed to expand tls_require_ciphers");
 
 if (!(expciphers && *expciphers))